A nitrogen-doped molybdenum disulfide/three-dimensional graphene composite material

A technology of molybdenum disulfide and composite materials, which is applied to structural parts, electrical components, battery electrodes, etc., can solve the problems of low product utilization, complicated and time-consuming operations, and difficulties in obtaining raw materials, achieving fast heating speed, firm combination, The effect of not easy to accumulate particles

Active Publication Date: 2021-07-09
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In order to solve the problems in the preparation of nitrogen-doped graphene composite materials in the prior art, such as complex equipment, cumbersome process, complicated and time-consuming operation, low product utilization rate, difficulty in obtaining raw materials, and large loss of nitrogen-doped precursors during nitrogen doping Low nitrogen doping content and the aggregation and accumulation of nanoparticles during the long-term heat treatment process of active components and graphene. The method of the material, the nitrogen content of the obtained material is high, the utilization rate of the raw material is significantly improved, the product does not need washing, separation, drying and other processes, and can be directly used as the negative electrode material of the lithium battery, and the application performance is good

Method used

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  • A nitrogen-doped molybdenum disulfide/three-dimensional graphene composite material
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  • A nitrogen-doped molybdenum disulfide/three-dimensional graphene composite material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] (1) Weigh 1.0 g of graphene oxide and 3.0 g of L-cysteine ​​and disperse them in 20 mL of 37% formaldehyde aqueous solution, and place them in an ultrasonic machine to disperse evenly and record as dispersion liquid A.

[0042] (2) Weigh 3.0 g of melamine, 1.2 g of sulfur powder and 5.2 g of ammonium paramolybdate into 40 mL of deionized water, and place them in an ultrasonic machine to disperse them uniformly and record as dispersion B.

[0043] (3) Mix Dispersion A and Dispersion B, heat the water bath to 60°C and stir for 10min. Subsequently, triethanolamine was added to the reaction solution, the pH value of the reaction solution system was adjusted to 8.0, and the mixture was ultrasonically mixed evenly. The resulting solid was freeze-dried.

[0044] (4) The product obtained in step (3) was placed in a microwave reaction chamber, and 100 mL / min of argon was purged for 1 h. The nitrogen-doped molybdenum disulfide / three-dimensional graphene composite material was o...

Embodiment 2

[0046] (1) Weigh 1.0 g of graphene oxide and 3.0 g of L-cysteine ​​and disperse them in 30 mL of 37% formaldehyde aqueous solution, and place them in an ultrasonic machine to disperse evenly and record as dispersion liquid A.

[0047] (2) Weigh 5.0g of melamine, 2.1g of sulfur powder and 10.0g of ammonium paramolybdate into 40mL of deionized water, and place it in an ultrasonic machine to disperse it uniformly and record it as dispersion B.

[0048] (3) Mix Dispersion A and Dispersion B, heat the water bath to 60°C and stir for 10min. Subsequently, triethanolamine was added to the reaction solution, the pH value of the reaction solution system was adjusted to 8.0, and the mixture was ultrasonically mixed evenly. The resulting solid was freeze-dried.

[0049] (4) The product obtained in step (3) was placed in a microwave reaction chamber, and 100 mL / min of argon was purged for 1 h. The nitrogen-doped molybdenum disulfide / three-dimensional graphene composite material was obtai...

Embodiment 3

[0051] (1) Weigh 1.0 g of graphene oxide and 4.0 g of L-cysteine ​​and disperse them in 30 mL of 37% formaldehyde aqueous solution, and place them in an ultrasonic instrument to disperse evenly and record as dispersion liquid A.

[0052] (2) Weigh 10.0g of melamine, 1.2g of sulfur powder and 5.0g of sodium molybdate, add them into 40mL of deionized water, and place them in an ultrasonic machine to disperse them uniformly and record as dispersion B.

[0053] (3) Mix Dispersion A and Dispersion B, heat the water bath to 70°C and stir for 10min. Subsequently, triethanolamine was added to the reaction solution, the pH value of the reaction solution system was adjusted to 8.0, and the mixture was ultrasonically mixed evenly. The resulting solid was freeze-dried.

[0054] (4) The product obtained in step (3) was placed in a microwave reaction chamber, and 100 mL / min of argon was purged for 1 h. The nitrogen-doped molybdenum disulfide / three-dimensional graphene composite material w...

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Abstract

A nitrogen-doped molybdenum disulfide / three-dimensional graphene composite material, which uses formaldehyde as a bridge to make it moderately cross-linked with melamine to form a nitrogen-doped precursor, and then undergoes hydrothermal reaction to make the nitrogen-doped precursor, active components and The three-dimensional graphene interacts and fuses uniformly, and then performs a solvent-free microwave reaction to synthesize a high nitrogen content doped molybdenum disulfide / three-dimensional graphene composite material. The composite material of the present invention avoids the loss caused by the sublimation of the nitrogen-doped precursor in the heating process in the traditional nitrogen doping process during the preparation process, improves the nitrogen doping efficiency, and the reaction conditions are progressive from mild to strong, realizing the nitrogen-doped precursor, The active components interact with graphene and fuse uniformly. The prepared nitrogen-doped molybdenum disulfide / three-dimensional graphene composite material has good stability, is not easy to denature in the air, is easy to store, and has a large specific surface area. As a negative electrode material for lithium-ion batteries, it provides a good channel for lithium ion transmission, showing Larger specific capacity and better cycle stability.

Description

technical field [0001] The invention relates to a nitrogen-doped molybdenum disulfide / three-dimensional graphene composite material, in particular to a molybdenum disulfide / graphene lithium battery negative electrode material doped with high nitrogen content, and provides a preparation method thereof, belonging to nanocomposite materials and its technical fields of application. Background technique [0002] Graphene is a two-dimensional honeycomb lattice structure carbonaceous material that is tightly packed by a single layer of carbon atoms. Since the discovery by Andre K. Geim of the University of Manchester in 2004, graphite Enenes have received great attention in both experimental and theoretical sciences. Graphene is only one carbon atom thick and is the thinnest known material, yet it is extremely strong and hard, stronger than diamond and 100 times stronger than the world's hardest steel. Due to its special nanostructure and excellent performance, it has potential a...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/36H01M4/58H01M4/583H01M10/052
CPCH01M4/362H01M4/5815H01M4/583H01M10/052Y02E60/10
Inventor 郭金廖莎张会成王少军凌凤香
Owner CHINA PETROLEUM & CHEM CORP
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